High

Openshift/oauth-server: openshift/oauth-server: quadratic-time dos via accept-language header underscore bypass on unauthenticated login endpoints

Type: advisorySource: Official CVE List1 source record

A flaw was found in openshift/oauth-server. The OAuth login and error page endpoints pass the unauthenticated Accept-Language header to golang.org/x/text/language.ParseAcceptLanguage() without input validation. A bypass of the CVE-2022-32149 mitigation exists: the upstream guard counts only '-' characters but the internal BCP 47 scanner aliases '_' to '-' after the guard check. An unauthenticated attacker can send a crafted Accept-Language header using '_' separators to trigger quadratic-time parsing, consuming excessive CPU and denying authentication to all cluster users.

Announced 1 Sept 2026Group revision 1

Original source ↗

CVE-2026-49329

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-49329

Red Hat OpenShift Container Platform 4.14

Source reference: /containers/cna/affected/0/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat OpenShift Container Platform 4.15

Source reference: /containers/cna/affected/1/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat OpenShift Container Platform 4.18

Source reference: /containers/cna/affected/2/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat OpenShift Container Platform 4.19

Source reference: /containers/cna/affected/3/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat OpenShift Container Platform 4.20

Source reference: /containers/cna/affected/4/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat OpenShift Container Platform 4.21

Source reference: /containers/cna/affected/5/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat OpenShift Container Platform 4.22

Source reference: /containers/cna/affected/6/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "cpes": [
      "cpe:/a:redhat:openshift:4.14::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift Container Platform 4.14",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791839120",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openshift4/ose-oauth-server-rhel8",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift:4.15::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift Container Platform 4.15",
    "versions": [
      {
        "status": "unaffected",
        "version": "1791598539",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openshift4/ose-oauth-server-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift:4.18::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift Container Platform 4.18",
    "versions": [
      {
        "status": "unaffected",
        "version": "1790882323",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openshift4/ose-oauth-server-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift:4.19::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift Container Platform 4.19",
    "versions": [
      {
        "status": "unaffected",
        "version": "1790611633",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openshift4/ose-oauth-server-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift:4.20::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift Container Platform 4.20",
    "versions": [
      {
        "status": "unaffected",
        "version": "1790702087",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openshift4/ose-oauth-server-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift:4.21::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift Container Platform 4.21",
    "versions": [
      {
        "status": "unaffected",
        "version": "1790707106",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openshift4/ose-oauth-server-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:openshift:4.22::el9"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat OpenShift Container Platform 4.22",
    "versions": [
      {
        "status": "unaffected",
        "version": "1790713150",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "openshift4/ose-oauth-server-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  }
]

Related CVEs: CVE-2026-49329
Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event: #52592 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 14:47:31 GMT
Publisher date: Tue, 01 Sep 2026 15:30:57 GMT

Read the original announcement

Revision history

25 Oct 2026CVE-2026-49329 · Revision 1Source updated